Sheet-delivering device for printing presses



A. FALLOT SHEETl DELIVERING DEVIGE FOR PRINTING PRESSES Fileg `Feb.2,9', 1924 from the printing cylinder by grippers ar-KJ Patented oct.r25, 1927.

.UNl'rlazDl STATES "PATENT oFFIcE.

ALFRED FALLOT, OF PLAUEN, GERMANY; HARRY PRIESTER EXECUTOR OF SAID fALFRED EALLO'J?,l DECEASED.

' i l SHEET-DELIVERING DEVICE FOR PRINTING PRESSES.`

Application Ied February 29, 1924, Serial This invention relates to asheet delivering device for sheet printing presses. In the machines ofknown type the sheet is taken ranged on an endless chain and conveyed tothe delivering pile.,V The grippers open as soon as the sheet is abovethe delivering pile so that the sheet drops on the pile, the sheetpossessing a speed in the direction in which the gripper is moving.Thisspeed is comparatively great as the speed of the gripper depends onthe-revolving speed' of the cylinder. The sheets are therefore notdelivered uniformly and they strike against the stops with a certainshock so that, especially in'thin sheets, the edge'of the' sheet isfrequently damaged. According to the invention the sheet is deliverednot in the direction in which the gripper chain moves, but in theopposite direction. With this object' in view the sheet is gripped bythe .mechamcal grippers, sucking cups `or the like at the rear end, thegrippers being mounted on a carriage which up tothe moment at which thegripper release moves at the same. speed or at a lower speed than thesheet mthe direction of'movement of the gripper where-` upon thedirection'of movement of the slide is reversed' and the sheet isdelivered on the pile by the slide grippers. A blow pipe is preferablyarranged above the vsheet blow vupon the front part ofthe sheet previousto the opening-of the chain grippers, .sald blow pipe oscillatingafterxthe chain grlpper has opened, so that the air ycurrent act's'then upon-the rear yend of the sheet. With the improved device it is possible toregulate .the speed of the delivering movementat will; and it uwill begenerally considerably slower than with the knowndevices. The front edgeof the sheetcomes rst, in contact with the pile, then the rmiddle of thesheet and finally the rear edge of the same, lso that a steady anduniform delivering of the sheets is ensured. l

The invention will be best understood from a consideration of thefollowing detailed `description taken in connection `with theaccompanying drawings forming a part of this specification, with theunderstanding that while on the drawings tw-o embodiments of theinvention are shown, the invention is not confined to any strictconformity with the showing of the drawings, but may be em- No. 696,001,and in Germany Maren 7,- 192s.

bodied inany manner which does not consti-- tute a material departurefrom the salient features of the invention.y

In the drawing Fig. 1 is a' side elevation of the sheet delivermgdevice.

Fig. 2 shows a slightly'modiied form of construction.

Fig. .3 shows a 'generic constructive detail in cross section.

The sheet a is taken from the printing cylinder b by the'gripper carranged ony the conveyer chain d and conveyed to the delivering pile e.The sheet a passes between the lateral feeding rollers f which maintainit stretched sol that the sheet is conveyed to the pile in a uniformly'stretched position. Below the sprocket-wheel g which is nearest to theprinting cylinder b a carriage t is arrangedwhich carries .a suction `cwith a gripperformed by sucker cups i. When the rear end of the sheetl ahas come out from between the feeding rollers f the -sheet comesin'contact with the sucker cups lwhich are put into communication with apartial vacuumv and the carriage h moves inthe direction of the sheet aunder the inluence of -the reciprocating toothed seg-- ment l which iscontrolled by an eccentric m. As soon as the chain gripper c has7travelled beyond the end of the `delivering pile e a roller lever nconnected with the gripper strikes against a curved guide bar o wherebythe gripper is opened and releases the sheet a. At the same time the`suction pipe k is made to communicate with a space 1n which vacuumexists so that the rear end of the sheet a is sucked upon the sucker.

forward movement'of the sheet the blow i P1Pe to thg position shown iniull 1ines,a nd', -as soon as the sheet has been releasedjb'y thegrippers c, it blows upon the front end of the sheet which isconsequently vpressed on in e reversed direction th'e blow pipe goscillatesbackward into the posit1on indthe' ile. During the.'movementof the sheet has executed an' oscillating movement. l n

v'cated in dotted lines and blows, as soon as a `the sheet has beenreleased by the sucker `inFig. 3. When the lever cups z', upon the rearend of the sheet.v The air under pressure which acts upon the sheet isprefera ly heated so that the ink on the sheet is dried; Means forrocking thejblow pipe g are shown in Figure 3 but it is to be understoodthat the said means form no' part of the present invention andthat anyrconvenient mechanism may beemplofed for the purpose in question. Thecurve guide bar o is adjustably mounted on the frame r, as shown in Fig.3,so that the sheet delivering device may be used for sheets ofdifferentlengths. The eccentric m, which controls the. movement of thetoothed segment l, is adapted to be adjusted on a scale in accordancewith the height of the sheet.

' In order to permit the printer vto pull t. The sheet t en drops upon asupport 'uso that it may be removed by hand. The

lever s is connected with a device for shut the sucker cups ting off thevacuum so that whenthe curved 'i do not suck on the sheet a guide bar ohas been removed.

Instead of the grippers on carriage h being composfed of the suction ipelc, any ot er element may be provided or gripping 'the rear edgre amechanica gripper o mounted on the carof thesheet, as for lnstance,`

riage J1.. Fig. 2.'

' I claim 1. In a sheet delivering device for print- This arrangement isshown in ing presses, gripper elements conveying the sheets from theprinting cylinder to a second group of gripperelements which moves inthe direction of the conveying movement,

grips the sheet and reverses its direction of movement after the sheethas been released by the first mentioned conveying elements, a blowingdevice which executes an oscillating movement ina forward directionduring the'forward movement of the sheet and a backward oscillationduring the rearward movement of the sheet, the air blowingat first uponthe front part and afterward upon the rear end of the sheet.

2. Ina sheetdelivering device for print ino' shets from the printingcylinder to a second groupof gripper elements whichmoves in thedirection of the conveying movement,

grips the sheet and reverses its direction of movement after the sheethas been released by the first mentioned conveying elements, a blowingdevice which executes an oscillating movement in 'a forward directiondurin the forward movement of the sheet and a ackward oscillation duringthe rearward movement of the sheet, the air lng device serves at thesame time as a drilng device.

testimony whereof I aiiix my signature.

` y ALFRED FALLOT for the blower belng preliminarily heated so that theblow.

presses, gripper elements conveying the

